erica ferrari live for us this morning in newtown, connecticut. thank you. >>> well, the school massacre in connecticut presents a challenge for parents and teachers, thousands of miles away. the key question now, how should we communicate with kids about it? cbs reporter cate caugiran is in san francisco with that part of the story. good morning. >> reporter: good morning, brian. the tragic events of last friday have impacted us all and this morning as teachers and students here in the bay area go back to school, there are unanswered questions. the san francisco unified school district is one of many acknowledging how hard it will be for educators and students. mayor ed lee and the superintendent released a statement letting our schools know there will be counselors available today to help anyone deal with trauma and stress. the images of last friday's newtown shooting across the country has hit us here at home. psychologists say younger children will have the hardest time understanding it all. >> so for those children it's really important to tr